This is a Quick Mode Off icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 12,300 icons, all in the same style and quality.
This image is composed of a lightning bolt. The lightning bolt is shaped liked an hourglass that has been tilted on its side. There is a diagonal slash striking through the lightning bolt going from the upper left corner to the bottom right corner of the image.